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x in (-oo:+oo)
X/4-(2/3) = (2*x)/5 // - (2*x)/5
X/4-((2*x)/5)-(2/3) = 0
X/4+(-2/5)*x-2/3 = 0
1/4*X-2/5*x-2/3 = 0 // - 1/4*X-2/3
-2/5*x = -(1/4*X-2/3) // : -2/5
x = (-(1/4*X-2/3))/(-2/5)
x = -5/2*(2/3-(1/4*X))
x = -5/2*(2/3-(1/4*X))
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